package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private final String wxLoginURL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    WeChatProperties weChatProperties;


    @Autowired
    UserMapper userMapper;

    /**
     * 用户登录
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        /**
         * 获得openid
         */
        String openid = getOpenid(userLoginDTO);

        //是不是新用户,要不要完成自动注册
        User user=userMapper.getByOpenId(openid);

        if (user==null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        //调用微信服务
        Map<String, String> params = new HashMap<>();
        params.put("appid", weChatProperties.getAppid());
        params.put("secret", weChatProperties.getSecret());
        params.put("js_code", userLoginDTO.getCode());
        params.put("grant_type", "authorization_code");

        String json = HttpClientUtil.doGet(wxLoginURL, params);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        return openid;
    }
}
